Gjerde, Arild; Jeroen Heijmans; Bill Mallon; Hilary Evans (April 2013). "Charlie Kieffer Bio, Stats, and Results". Olympics. Sports Reference.com. Archived from the original on April 18, 2020. Retrieved April 7, 2013.
web.archive.org
Gjerde, Arild; Jeroen Heijmans; Bill Mallon; Hilary Evans (April 2013). "Charlie Kieffer Bio, Stats, and Results". Olympics. Sports Reference.com. Archived from the original on April 18, 2020. Retrieved April 7, 2013.